Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual é o intervalo de declaração conjunta de casados ou viúvo qualificado em que a declaração separada de casados é $33,951–$68,525?
 ###Tabelas: CREATE TABLE singles_finals:_18_11–7 (singles_finals:_18_11–7_id AUTO_INCREMENT PRIMARY KEY, Outcome VARCHAR, Date VARCHAR, Tournament VARCHAR, Surface VARCHAR, Opponent VARCHAR, Score VARCHAR) CREATE TABLE league_table (league_table_id AUTO_INCREMENT PRIMARY KEY, Rank INT, Name VARCHAR, Point INT, Played INT, Draw INT, Lose INT, Goal in INT, Goal loss INT, Goal diff INT) CREATE TABLE regular_and_capital_gains_tax_rates_for_2009 (regular_and_capital_gains_tax_rates_for_2009_id AUTO_INCREMENT PRIMARY KEY, Marginal Ordinary Income Tax Rate VARCHAR, Single VARCHAR, Married Filing Jointly or Qualified Widow(er) VARCHAR, Married Filing Separately VARCHAR, Head of Household VARCHAR) CREATE TABLE series_10 (series_10_id AUTO_INCREMENT PRIMARY KEY, Episode VARCHAR, First aired VARCHAR, Entrepreneur(s) VARCHAR, Company or product name VARCHAR, Money requested (£) VARCHAR, Investing Dragon(s) VARCHAR) CREATE TABLE percussion_scholastic_concert_world_class (percussion_scholastic_concert_world_class_id AUTO_INCREMENT PRIMARY KEY, Ensemble VARCHAR, Gold Medals INT, Silver Medals INT, Bronze Medals INT, Total Medals INT)  
SELECT Married Filing Jointly or Qualified Widow(er) FROM regular_and_capital_gains_tax_rates_for_2009 WHERE Married Filing Separately = $33,951–$68,525